Need to bleed the brakes, Magura site says royal blood is transmission medium low viscosity mineral oil.
I am thinking it may be cheaper to buy a bottle of transmission type oil from a car type shop rather than a tiny bottle from a bike shop.
if so is there a brand and type i should get or am i better just to get the proper magura stuff?

Im fairly sure its just mineral oil with a fancy name.

my lbs stocks big bottles of cheap mineral oil.

probably get even better vfm if you use a car place. Ive noticed no problems with using non ‘royal blood’ or even from mixing different oils.

I use halfords mineral oil, think they stock it for citroen suspension.

Shimano mineral oil worked fine for my Martas and Louise brakes. You can get a big bottle (around 1L) from Wiggle for around £13-15 and it will last for ages.

LHM mineral oil from Halfrauds – about £6 / litre. Been using it in Magura clutches on KTM motorbikes for years without a problem